Please identify these NOS 6550s

brxl10-24-2020 5:50pm

brxl OP Details Discussions Posts This discussion Message User 21 posts 10-24-2020 at 05:59pm Copy Comment URL Report Comment Edit Delete http://img4.imagetitan.com/img.php?image=23_e1.jpg
brxl OP Details Discussions Posts This discussion Message User 21 posts 10-24-2020 at 06:02pm Copy Comment URL Report Comment Edit Delete only have one of this http://img4.imagetitan.com/img.php?image=23_ge1.jpg and two that show white fog http://img4.imagetitan.com/img4/small/23/23_ge2.jpg any idea on if/how a complete quad can be assembled? Any use in the "good" one, assume the fogged ones goners? Measure it and ask the usual outlet for a "match"?
jond Details Discussions Posts This discussion Message User 5,778 posts 10-24-2020 at 09:53pm Copy Comment URL Report Comment Edit Delete Obviously one of those tubes is a GE that's the brand. I am not sure on the other tube. If you're trying to assemble a matched quad you need to get them tested and see how closely their parameters match.
brxl OP Details Discussions Posts This discussion Message User 21 posts 10-25-2020 at 10:29pm Copy Comment URL Report Comment Edit Delete I believe the logo on the first one is Shuguang. Because they are at least 20 years old I wonder how they compare to a current batch?
noromance Details Discussions Posts This discussion Message User 9,763 posts 10-26-2020 at 02:44am Copy Comment URL Report Comment Edit Delete I wouldn't bother. A new set of 4 matched 6550/KT88 run $120-$200 JJ/Tung Sol/Gold Lion.